P0647 OBD Error Code: Problem & Solutions
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OBD Code P0647 - A/C Clutch Relay Control Circuit High
Error Code P0647 is defined as A/C Clutch Relay
Control Circuit High. This code is set when the PCM detects a high voltage
situation in the A/C conditioning relay control circuit. Based on the vehicle and specific malfunction, this code may be set as
many as eight times before the Check Engine light is activated. When the PCM or one of the other supporting control modules has detected
improper signals within the A/C clutch relay control electrical circuit, code
P0647 will be set.
Learn More About OBD Error Code P0647
The P0647 code is a generic OBD-II trouble code
that detects a problem with the A/C (air conditioning) clutch relay control
circuit. The job of the A/C (air-conditioning) clutch
relay control circuit is to control the air conditioning’s operation. This code
means that the A/C clutch relay control circuit is malfunctioning due to a
faulty control relay, compressor driver, damaged wiring components. A/C clutch relay circuit is monitored when ignition is on and battery
voltage is greater than 10.4 volts. Code P0647 is set
by the PCM when it detects a too high voltage condition within the air
conditioning relay control circuit.
What causes this problem with the A/C Clutch Relay Control
Circuit High?
- Open or shorted A/C Clutch Relay
Harness
- Defective A/C Clutch Relay
- Poor electrical connection
- Faulty Control Module
- Loose or broken ground strap
- Blown Fuses
- Flawed A/C Compressor
- Faulty PCM
Replace/Repair These Parts To Fix OBD Code P0647
- A/C Clutch Relay - Almost every single electrical system on a car is powered
through some kind of switch or electrical relay, and the AC system and
compressor are no exception. The AC compressor relay is responsible for
supplying power to the AC compressor and clutch. Replace or repair it if you
discover it faulty.
- A/C Compressor Clutch - It is a belt drive attached to the engine spins constantly,
providing energy for the AC compressor. The belt turns a rotor, which has a
friction plate attached to it. Near the rotor is an electromagnet--a coil of
wire which produces a magnetic field when current is run through it. It should
be inspected thoroughly and repaired as required.
- A/C Compressor - An air conditioner compressor is the component in the system
that raises the temperature and pressure of the vapor refrigerant that leaves
the evaporator coil. Check it out thoroughly and if you find it faulty replace
it.
Symptoms Of OBD Error Code P0647
This issue should not be unattended
as it could develop into something much more serious fairly quickly. Below are
the common symptoms for the code P0647. If you experience these please bring
your vehicle to a reputable repair facility.
- A/C may not work well
- A/C may not work at all
- Illuminated check engine light
How To Correct P0647 A/C Clutch Relay Control Circuit High
Due to trouble code P0647 you may
not face any drivability issues; however, it is possible that the air
conditioning system will not properly work. Following repairs and replacements
may help you to fix this code:
- Replacement of the A/C clutch relay
- Repair or replacement of faulty
wiring
- Repair or replacement of ground
straps
- Replacement of control module
- Replacement of the blown fuse or
fuse-able link (if applicable)
- Evacuate and recharging of the A/C
system
- Cleaning connectors corrosion
- Replacement of the A/C clutch
- Replacement of the A/C compressor
- Replacement or re-flashing of PCM
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Easy Diagnosis Of Engine Error OBD Code P0647
To correct or fix this code one should seek assistance
from a trained automotive diagnostician but if you want to do it by yourself,
please follow the below mentioned steps:
- Begin with a visual inspection of
all wiring and connectors.
- Repair or replace damaged,
disconnected, shorted, or corroded wiring, connectors, and components as
necessary.
- Always retest the system after
repairs are completed to ensure success. If all system wiring, connectors, and
components (Including fuses) appear to be in normal working order, connect the
scanner (or code reader) to the diagnostic connector and record all stored
codes and freeze frame data.
- This information can be extremely
helpful in diagnosing intermittent conditions that may have contributed to this
code being stored.
- Continue by clearing the code and
operating the vehicle to see if it returns.
- This will help to determine whether
or not the malfunction is intermittent.
- After the codes are cleared, test
drives the vehicle to see if the code returns.
- If the code fails to immediately
return, you may have an intermittent condition.
- A specialized diagnostic CAN scanner
will show pin values and control module operation without risking a meltdown.
- It can accurately diagnose computer
and circuitry problems by monitoring vehicle operation while the vehicle is
being operated.
- To diagnose this type of code using
a digital volt ohmmeter would entail probing thousands of circuits,
independently.
- Control module ground circuits
should be tested for continuity with battery ground.
- These types of codes are frequently
caused by defective or disconnected system grounds.
- Look for loose or corroded
electrical connectors that may increase circuit resistance and cause these
types of codes to be stored. Obtain a CAN bus system wiring diagram and/or pin
out value chart, and then use the digital volt ohmmeter to test continuity
between individual controller connectors.
- Compare your findings with the
manufacturer’s referenced values and repair open or shorted circuits as
required.
Common Mistakes When Diagnosing the P0647 Code
Symptoms and stored codes that are
present as a reaction to a communication failure are often misdiagnosed and
repaired as the cause of the problem. Obviously, this leads to an unsuccessful
repair.